Hole saw



FIG. 1 is a top perspective view of a hole saw showing my new design;

FIG. 2 is a side elevational view thereof, the drill bit attachment is shown in broken lines for illustrative purposes only and forms no part of the claimed design;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a side elevational view of the opposite side of FIG. 2. 

The ornamental design for a hole saw, as shown and described. 